Wort: From plant to fermenting liquid

In everyday English, a wort is a small, hard growth on the skin, usually on the hands or feet. The word comes from Old English and shares roots with similar terms in German and Dutch. Nobody outside medicine thinks much about worts.

In brewing and distilling, wort is something entirely different: the sugar-rich liquid drawn from mashed grain. The process begins when a brewer or distiller soaks ground malt (or other grain) in hot water. Enzymes in the malt break down starches into fermentable sugars. This liquid, now called wort, is then separated from the spent grain. The wort is cooled, pitched with yeast, and fermentation begins. In beer production, this becomes beerwort. In whisky-making, the wort is fermented and later distilled.

The term wort in brewing is old and specific to the trade. It appears in brewing records and guild documents for centuries. The word likely comes from an Old English root meaning 'to turn' or 'to mix', reflecting the medieval sense of a liquid derived from grain through infusion and steeping. No other modern industry uses wort in this sense.

There is one internal distinction: mashwort refers to wort that has not yet been separated from the solid grains. Once the brewer runs off the liquid and leaves the mash behind, that liquid becomes wort in the strict sense. Both terms describe stages in the same process, but mashwort is the intermediate state between mashing and lautering.

The isolation of wort as a technical term reflects brewing's maturity as a craft. Brewers needed a single word for a single substance at a single stage of production. The word wort does not cross into other food or beverage industries. Vinegar makers have their own terminology; cider makers do not use it. Wort belongs entirely to beer and malt spirits.